sghwerin



(No Model.)

B. P. SOHWERIN. ELECTRIC HEADLIGHT- Patented Apr. 13, 1897.

RENNIE P. SCIIWERIN, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE MARKET STREET RAILWVAY COMPANY,

OF SAME PLACE.

ELECTRIC HEADLIGHT.

SPECIFICATION forming part of Letters Patent No. 580,557, dated April 13, 1897. Application filed September 30, 1896. Serial No. 607,404. (No model.)

siding in the city and county of San Francisco, State of California, have invented an Improve ment in Electric Headlights; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the class of headlights especially adapted for the use of electric lights and to be carried by electric cars.

My invention consists of the parts and the constructions and combinations of parts hereinafter described and claimed.

The general object of my invention is to provide a simple and serviceable headlight adapted for the use of an incandescent electric lamp and one which shall be perfectly ventilated and which will permit ready access to its interior.

Referring to the accompanying drawings, Figure 1 is a front view showing the hinge and hinge-bolts. Fig. 2 is a side view of the headlight. Fig. 3 is a vertical section through the center of the headlight at right angles to the glass front.

The headlight consists of a silvered para bolic mirror A, inclosed by a metallic casing B, of like shape on the back,-and by a circular fiat glass hinged door C in front. This parabolic mirror has an opening in its upper surface through which depends vertically an incandescent electric lamp D, so that the cen ter of the source of illumination is exactly in the focus of the mirror.

The casing 13, above the opening therein, has an opening cut in it, and a suitable lampsocket E is soldered in this opening, the necessary Wires (not here shown) being admitted through the top of this socket.

The headligh teasing is supported on a sin gle leg F, said leg being riveted at one end to the under side of the casing at the other end through the B and clamped car-ro0f W and having a joint at f, whereby the direction of light can be changed through an angle of one hundred and eighty degrees in a plane parallel to the direction of the track and can be clamped rigidly at any position in its travel. Means for securing ventilation are as follows:

'tion of the car.

Cold air is admitted through holes G at the base of the casing B and in front of the lower edge of the mirror. Thence passing up past the heated lamp-globe the air finds an exit through holes H between the casing and the mirror at the top, and is thence drawn out at the apex at the rear of the parabolic casing by the suction caused by the forward mo- It thence-passes through exits I at the back, which are protected from rain by a metallic cover K with an openingk at its lower edge.

The means for opening and closing the glass front for the replacing of burned-out incandescent lamps and of the changing of cracked glass fronts are as follows: The door C is furnished with one hinge L at the top and is fastened at two points at the lower edge, as shown in Fig. 1, by hinge-bolts N, furnished with thumb-nuts 0, said hinge- 7o bolts being fastened at their base to lugs P, soldered to the casing, and swinging into slot-ted lugs Q, forming part of a metallic frame of the headlight-front. This front is furnished upon its under side with a packing- 7 5 ring R, (shown in Fig. 3,) so that by means of the pressure exerted by the thumb-nuts the front is rendered water-tight.

The hinge at L is a removable one by the employment of a cotter-pin S for the pintle of the hinge, said pin being a split-ended one, as shown in Fig. 1, and adapted to be readily taken out, whereby the front can be easily removed for thepurpose of changing the glass in the frame.

The glass is held in position against the frame of the hinge front by a wire-ring T, fastened at several points by clips U, of soft copper or other material, and is made water-tight I by a luting of putty. 0

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In an electric headlight, the combination of a parabolic casing having a top opening, a 5 lamp-socket fixed in said opening, a parabolic mirror within the casing and separated therefrom to form a ventilating space or channel, an incandescent lamp fitted to said socket and passing through an opening in the mirror, a too flat-glazed front for said casing, an air-inlet into the bottom of the casing just in front of the lower edge of the mirror, an air-outlet between the upper portion of the mirror and the ventilating-space and an outlet from said space into the open air.

2. In an electric headlight, the combination of a parabolic casin g having an opening in its top, a lamp-socket fixed in said opening, a mirror within and conforming to the shape of the casing, and separated therefrom to form a ventilating space or channel between the two and having an opening in line with the opening in the casing, an incandescent electric lamp fitted to said socket and passing through the opening in the mirror, a flatglazed front door for the casing, means for admitting air into the mirror just in advance of itslowerfront edge, an opening between the upper front portion of the mirror and the back passage, a discharge at the apex of the easing and a controllably-jointed leg on which said casing is supported and by which the headlight is adjusted as to its angle.

3. An electric headlight consisting of a parabolic mirror, a casing of like shape protecting the back of the mirror and separated therefrom to leave an intervening passage for ventilation, a glazed front, an aperture in the base of the casing in front of the lower edge of the mirror for the entrance of cold air, holes between the top of the mirror and the casing to permit the air to pass through to the. back passage between the casin g and the mirror, and exit-holes at the apex of the back casing for the escape of the air.

4. An electric headlight consisting of aparabolic mirror, a casing of like shape protecting the back of the mirror and separated therefrom to leave an intervening passage for ventilation, a glazed front, an aperture in the base of the casing in front of the lower edge of the mirror for the entrance of cold air, holes between the top of the mirror and the casin g to permit the air to pass through to the back passage between the casing and the mirror, and exit-holes at the apex of the back casing for the escape of the air, and a shield over said apex to protect the exit-holes, said shield having a bottom opening through which the air escapes.

In witness whereof I have hereunto set my hand.

R. P. SCHWERIN.

WVitnesses:

J. E. THOMPSON, EDWIN ONETT. 

